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Which wavelength is most suitable for pumping and erbium doped fiber amplifier? 

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Erbium-doped fiber amplifiers (EDFAs) promise to revolutionize lightwave technology, lowering system costs while enhancing network performance and reliability.
The authors report that erbium doped Al/sub 2/O/sub 3/-P/sub 2/O/sub 5/-SiO/sub 2/ based fibres can be used as efficient optical amplifiers provided the concentration of erbium is kept low.
It is shown that highly saturated, erbium-doped fiber amplifiers (EDFAs) can be employed as efficient power amplifiers.
This experiment demonstrates the potential of erbium-doped fiber amplifiers for application in wavelength-division-multiplexed communication systems.
Measured data are presented confirming that the dependence of the gain, output saturation power, and noise of erbium-doped fiber amplifiers on the signal and pump wavelength can be described by simple equations derived from the model.<<ETX>>
This means that the proposed method is useful to design optimized erbium-doped photonic crystal fiber amplifiers and lasers for particular applications.
In both scenarios, we demonstrate similar performance to an erbium-doped fiber amplifier.
This profile provides a novel way of looking at the gain characteristics of erbium-doped fiber amplifiers.
Experimental results are presented showing that resonant pumping can significantly improve the stability of erbium-doped fiber lasers.
Such an erbium-doped dispersion compensating fiber should be a promising alternative as a more compact unit than the combination of an erbium-doped fiber amplifier and dispersion compensating fiber as two individual components.

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